Cat Tail Language: 10 Secret Messages Your Cat Is Sending You With Their Tail Chewy Cat Tail Language Meanings: What Each Flick, Swish & Curl Means Why Do Cats Shake Or Vibrate Their Tails? What Does it Mean? Kitty confidential: 13 secret signals all cat owners need to know from a quivering tail to aeroplane ears Cats The Guardian Understanding Your Cat's Vibrating Tail Behavior I have always wondered why he does the tail shake when we give him scritches